Ink dating aginsky

The aim of this work is to characterize the degradation processes of methyl violet and ethyl violet, two typical ballpoint dyes by using laser desorption/ionization (LDI) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS), and to evaluate the possible application of the method to forensic examination of documents.The mass spectrometric methods were first tested and were found to be adequate for the purpose of this work.The determination of the age of an ink entry from a questioned document is often a major problem and a controversial issue in forensic sciences.

He is currently employed full time with a large state government forensic laboratory… Durina is a Forensic Document Examiner with over 26 years of experience in the field of forensic science.Moreover, it is possible to analyze the dye from a stroke directly from the paper (LDI-MS), so the sample preparation is minimized.The degradation of the dyes methyl violet and ethyl violet in strokes from a ballpoint pen was studied under laboratory conditions influenced by different factors such as light, wavelength of light, heat, and humidity.He is co-founder of Riley, Welch, La Porte and Associates…[Read More] Forensic Chemist and Document Dating Specialist Mr. Hanson is a Forensic Document Examiner with 21 years experience in the field of forensic science.

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